Emergency security maintenance (30 April 2026)¶

The Euler cluster was taken offline at approximately 1:00 AM today due to an emergency security maintenance.

The system status has been set to yellow, indicating that the cluster remains operational but is currently not accessible.

We are sorry for the inconvenience

Updates:¶

30 April 2026 14:30

The Euler login nodes are back online. Users can access their data and submit jobs. Submitted jobs will remain in the queues until those are again activated. Slurm partitions will be reopened gradually, starting with the 4-hour and 24-hour queues. The long (120-hour) queues will remain closed until early next week. Compute nodes need to be rebooted, therefore the available capacity will be limited over the weekend. Please note that tomorrow is a public holiday, therefore support will be provided on a best-effort basis until beginning of next week.

30 April 2026 15:40

Batch jobs that were running when we took Euler off-line have not been affected and will run until their normal completion (4h, 24h or 120h). Jobs that requested more than 120h may be killed when they reach the 120h mark. (This is required for security reasons as we need to reboot all compute nodes within the next 5 days.)

05 May 2026 11:20

On 29 April 2026, a critical security vulnerability (Copy Fail, CVE-2026-31431) affecting nearly all Linux distributions was disclosed. The associated local privilege escalation exploit required only a short Python script and access to an unprivileged account. In response, we immediately suspended access to Euler without prior notice in order to protect the system. This enabled us to apply mitigation measures and review system logs to verify the integrity of the environment. Access to Euler was restored on the afternoon of 30 April. We apologize for the inconvenience and appreciate your understanding.